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- 저자 : Meiqiang Fan (검색결과 2 건)
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Meiqiang Fan,Yong Jin Zou,Hao Yin,Yan Li Huang,Chengqiao Xi,Haixin Kang,Chao Li,Jingjing Zhang,Chunju Lv,Meiqiang Fan,Zhi Chen 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2019 NANO Vol.14 No.3
A hollow silicon oxide coated with cuprous oxide and polyaniline (hSiOx/Cu2O/PANI) was prepared via Stober method, magnesium reduction and chemical oxidative polymerization. The hSiOx/Cu2O/PANI (SiOx 62 wt.%, PANI 33 wt.%, Cu2O 5 wt.%) presented charge/discharge capacities of up to 2000 mAhg -1 after 60 cycles at 0.2 Ag -1 current density and higher than 880 mAhg -1 at 8 Ag -1 current density. Microstructural analysis demonstrated that the improvement was due to the nanostructure of hollow SiOx sphere coated with Cu2O and PANI, which could release high stress caused by volume expansion during the lithiation/delithiation process and had little damage to electrode materials. Cycle voltammetry (CV) and electrochemical impedance spectroscopy (EIS) results further confirmed that Cu2O and PANI dual-coating improved reversibility and conductivity of hSiOx and prevented it to drop from the electrode surface.
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Shi Lei,Da Chen,Wenting Xie,Jing Zhang,Guangxing Ping,Meiqiang Fan,Laishun Qin,Liqun Bai,Zhi Chen,Chunju Lv,Kangying Shu 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2016 NANO Vol.11 No.1
In this work, thermally exfoliated graphene nanosheets (GNS) were employed to prepare novel Ag3PO4–GNS composite photocatalysts by a facile chemical precipitation approach. The asprepared Ag3PO4–GNS composite photocatalysts were characterized by X-ray diffraction (XRD) pattern, field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), Raman spectroscopy, thermogravimetric (TG) analysis, ultraviolet-visible diffuse re-flectance spectroscopy (DRS) and photoluminescence (PL) spectra. It was found that the Ag3PO4 particles were well deposited on the surfaces of GNS. Compared with bare Ag3PO4 and Ag3PO4–rGO composite, the Ag3PO4–GNS composite exhibited enhanced photocatalytic activity for the photodegradation of rhodamine B (RhB) under visible light irradiation. The photocatalytic degradation rate of Ag3PO4–GNS composite was 1.7 times that of bare Ag3PO4 and about 1.3 times that of Ag3PO4–rGO for the degradation of RhB. Furthermore, the photocatalytic stability of Ag3PO4–GNS composite was also greatly enhanced. This enhanced photocatalytic activity and stability could be ascribed to the positive synergetic effects between the Ag3PO4 particles and GNS sheets, which could provide a greater number of active adsorption sites, suppress charge recombination and reduce the serious photocorrosion of Ag3PO4. Moreover, the photocatalytic degradation of RhB over Ag3PO4–GNS composites was also optimized, suggesting that the optimal amount of GNS in the composites was 11.4 wt.%. This work shows a great potential of Ag3PO4–GNS composite for environmental treatment of organic pollutants.
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